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Ok, thought I would update this thread as I have now spoken with Viessmann and this is what you need. If using a 4 pipe system and using an unvented cylinder, the follow additional parts are required 7179 114 - Viessmann cylinder temp sensor 7179 057 - H1 Internal extension - for control...

sounds good 8)

Thanks for advice, i'll give them a bell as soon as I get some skive time at work.. :lol: :wink: Can you tell me which part I need to have the Viessmann control the 2 port valve for the unvented cylinder. I just got to make sure everything is here for when the installation starts...

Thanks for the replies. I've sent Viessmann an email as well. I did read in the manual about the internal diverter valve, I was mainly wondering if there was some bolt on kit which allowws the y-plan configuration. There is also going to be a Ultrasteel unvented cylinder installed. Does...

Hi all, I hoping someone with Viessmann installation experience can help me out. I have recently bought a Viessman 200-W system boiler (WB2B) With the following accessories. Vitotronic 200 Weather Comp Controller - 7193952 Vitotronic 300 Remote Control Unit -7248907...